Old glass power pole insulators: various sizes and colors. Some have chips.
I use mine, turned upside down as glass tea-light candle votives. Super cute.
Place a tea-light inside.
Can also use them as paperweights, you can hang them from the trees, etc. etc. Lots of options.
I will include some pictures that you can click on. I have six blue and five clear glass available. The rest of the pictures are of the ones I am keeping.